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Commitments and Contingent Liabilities - Environmental - Narrative (Details) $ in Millions			1 Months Ended		3 Months Ended	12 Months Ended
	Sep. 09, 2019 USD ($)	Jun. 29, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) lawsuit	Dec. 31, 2020 USD ($) lawsuit	Dec. 31, 2019 USD ($) Owner	Dec. 31, 2018 USD ($)	Sep. 30, 2020 lawsuit
Environmental Remediation [Line Items]
Environmental remediation activities amount				$ 3		$ 71	$ 200	$ 101
Sale of asset to third party				$ 39		5	9	$ 46
Accrual for environmental remediation activities					$ 390	390	406
Off-site Groundwater Remediation [Member]
Environmental Remediation [Line Items]
Estimated disbursements amount						$ 54
Off-site Replacement Drinking Water Supplies [Member]
Environmental Remediation [Line Items]
Accrued for operation, maintenance, and monitoring period						20 years
Accrual for environmental remediation activities						$ 31	18
Accrual for environmental loss contingencies, changes in estimates						$ 7
Off-site Groundwater Remediation for Operation, Maintenance, and Monitoring [Member]
Environmental Remediation [Line Items]
Disbursements period						20 years
Toxicity Studies [Member]
Environmental Remediation [Line Items]
Disbursements period						3 years
On-site Surface Water and Groundwater Remediation [Member]
Environmental Remediation [Line Items]
Accrual for environmental remediation activities					5
Estimated cost of remediation					140	$ 140
OM&M projected paid period						20 years
East Chicago, Indiana [Member]
Environmental Remediation [Line Items]
Sale of asset to third party		$ 1
Environmental remediation cost assumed by seller		21
Accrual for environmental remediation activities		21			11	$ 11	17
Gain on sale of asset		3
Purchase price of asset sold		1
Environmental remediation liability assumed by the buyer		$ 2
Oakley Site [Member]
Environmental Remediation [Line Items]
Sale of asset to third party	$ 7
Gain on sale of asset					6
Sale of asset to third party received amount	4				3
Proceeds contingent upon the completion of certain environmental remediation activities	3
Environmental remediation liability	$ 10				4	4	7
Fayetteville Works, Fayetteville, North Carolina [Member]
Environmental Remediation [Line Items]
Accrual for environmental remediation activities					194	194	201
Fayetteville Works, Fayetteville, North Carolina [Member] \| Off-site Groundwater Remediation [Member]
Environmental Remediation [Line Items]
Accrual for environmental remediation activities					$ 54	$ 54	$ 46
PFAS [Member]
Environmental Remediation [Line Items]
Civil penalty and investigative costs			$ 13
Percentage of efficiency to control PFAS						99.999%
Air quality test maximum period to conduct						90 days
PFAS [Member] \| Fayetteville Works, Fayetteville, North Carolina [Member]
Environmental Remediation [Line Items]
Percentage of efficiency to control PFAS						99.99%
Reduction of PFAS maximum period						2 years
Percentage of baseline						75.00%
Compensatory and Punitive Damages [Member]
Environmental Remediation [Line Items]
Number of private well owners seeking for damages \| Owner							800
Number of lawsuits filed \| lawsuit					3	3
PFOA [Member]
Environmental Remediation [Line Items]
Number of lawsuits filed \| lawsuit									3
Minimum [Member]
Environmental Remediation [Line Items]
Average time frame of disbursements of environmental site remediation						15 years
Maximum [Member]
Environmental Remediation [Line Items]
Average time frame of disbursements of environmental site remediation						20 years
Loss contingency, potential additional loss					$ 580	$ 580